Fastening armature-punchings to the spiders.



No. 789,454. PATENTED MAY 9. 1905.

' H. G. RBIST.

FASTENING ARMATURE PUNGHINGS TO THE SPIDERS.

APPLICATION FILED OOT.18,1901.

UNITED STATES Patented May 9, 1905.

PATENT OFFICE.

HENRY Gr. REIST, OF SOI-IENEOTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NE YORK.

FASTENING ARMATURE-PUNCHINGS TO THE SPIDERS.

SPECIFICATION forming part of Letters Patent No. 789,454, dated May 9, 1905,

Application filed October 18, 1901. Serial No. 79,144.

To a whom it may concern.-

Beitknown thatI, HENEYG. REIsr,a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Fastening Armature-Punchings to the Spiders, of which the following is aspeeification.

This invention relates to dynamo-electric machines; and its object is to improve the mode of fastening to a spider the laminations which compose the core of the armature. When an armatureis small, the punched laminations can be complete circles, so that no special means are needed to hold them on the spider; but in large machines the core is built up of segments punched to shape and assembled by interlocking dovetail slots on their inner edges with dovetail ribs on the periphery of the spider. It is desirable to have all the segments firmly held, so that care must be taken to make the slots and ribs fit exactly. My invention aims to reduce the labor and machine-work at this point and enable the punchings to be quickly and accurately assembled and firmly held in place.

To this end the invention consists in a spider and core-segment having keyhole-slots facing each other with a locking-bar having enlargements engaging with the enlarged portions of said slots. If this enlarged portion of the slots in the spider is to be circular, it can be drilled, thus insuring its accuracy, and the locking-bar can be milled, drawn, rolled, drop-forged, or cast, so as to fit said holes accurately.

In the accompanying drawings, Figure 1 is a side elevation of a portion of an armature structure embodying my invention. Fig. 2 is a perspective view of the locking-bar. Fig. 3 shows a modification. Fig. 4 is a perspective view of the locking-bar used therein, and Fig. 5 shows a modification of the keyholeslot in the armature-punchings.

The spider A has a cylindrical supportingsurface a for the core-punchings B, said surface being preferably interrupted at regular intervals by wide grooves At points radially in line with the portions of supportingsurface holes a are drilled through the spider 5 parallel with said surface. Narrow slots (1 are cut into said holes, thereby forming akeyhole-slot with a circular-walled enlarged portion. The inner edge of the core-punching B is provided with similar keyhole-slots?) of any 5 5 desired shape and spaced to come opposite the slots in the spider when the parts are assembled.

In Fig. 5 the keyhole-slot b in the armaturepunchings is shown as more nearly conforming in shape to that of the upper portion of the 60 key D.

A locking bar or key O is made by casting, rolling, drawing, drop-forging, milling, or other suitable method, having two circular heads 00, respectively fitting the circular portions of the keyhole-slots, and a web 0 fitting the narrow portions of said slots. In assembling the locking-keys are driven into the slots in the spider and then the punchings are slid into place on'the projecting web and head 0. In Fig. 2 the locking-key is a flat strip D, having a wide rib (Z to iit diametrically across the hole in the spider and a narrower rib (Z to similarly lit the hole in the punching. This key can be driven in with the ribs facing in either direction, as indicated by the dotted lines in Fig. 3.

WVhat I claim as new, and desire to secure by Letters Patent of the United States. is-

1. The combination with an armature-core 0 punching and a supporting member therefor, each provided with a keyhole-slot, the, said slot in said supporting member being provided with a drilled circular enlargement, of a locking-key having two enlargements con- 5 nected together, one of the key enlargements being located in the slot enlargement formed in the supporting member and the other key enlargement being located in the slot enlargement formed in the punching.

2. The combination with an armature-spider and core-punching each provided with a keyhole-slot having an enlarged portion, the enlarged portion of the spider being circular, of a locking-key having two enlargements connected together, one of said key enlargements entering the slot enlargement formed in the hole-slots b, and a looking-key 0 having the spider, and the other of said key enlargements beads 0, c and the web 0 1 entering the slot enlargement formed in the In witness whereof I have hereunto set my punching. hand this 15th day of October, 1901.

3. The combination with an armature-spi- HENRY G. REIST. der having the cylindrical supporting-surfaces l/Vitnesses: (0, intermediate slots a, and circular keyhole- BENJAMIN B. HULL,

slots (4 a of core-punchings B having key- FRED RUSS. 

